1989 Chevrolet S10 pick-up & Blazer electrical diagnosis and wiring diagram manual. This manual is used and does show wear. All pictures are of the actual manual that you will receive. This manual will be rolled up for shipping. This manual only covers the electrical system of your 1989 Chevrolet S10 pick-up or Blazer, you must refer to the main service manual for needed repairs (If you are not sure please ask if a specific topic or repair is included). These are the wiring diagrams used by the dealers. Thank You for looking.